SHARK VS SHARK

Cookiecutter sharkvsPacific sleeper shark

Length, weight and bite evidence—plus context from a human, city bus and blue whale. Every number below carries its uncertainty with it.

LivingIsistius brasiliensis×LivingSomniosus pacificus
QUICK VERDICT

Pacific sleeper shark is about 12× longer by these reference values.

Pacific sleeper shark uses a 7 m upper reference, compared with 0.56 m for Cookiecutter shark. Pacific sleeper shark's weight reference is about 181× heavier.

01

ON THE SAME SCALE

Human. Bus. Whale.
Pick your reference.

RELATIVE LENGTH · 0–24 METERS
ACookiecutter sharkabout 0.56 m / 22 in
BPacific sleeper sharkreported near 7 m / 23 ft
REFAdult human1.8 m · about 80 kg

Length bars use upper comparison values and do not show body depth, tail proportion or typical adult size. A long thresher tail, for example, does not equal whale-shark body mass.

02

THE NUMBERS

Side by side.

MeasureCookiecutter sharkPacific sleeper shark
Length referenceabout 0.56 m / 22 inreported near 7 m / 23 ft
Weight referencelarge-adult reference about 5 kg / 11 lblarge-animal estimate about 907 kg / 2,000 lb
Bite forceNo dependable maximum foundUnknownNo dependable maximum foundUnknown
HabitatDeep tropical and subtropical oceansCold North Pacific, often deep
DietPlugs of tissue from larger animals plus small preyFishes, squid, marine mammals and carrion
03

WHAT THE DATA CAN SAY

Size is not the whole animal.

Length and weight

Cookiecutter shark is represented by about 0.56 m / 22 in; Pacific sleeper shark by reported near 7 m / 23 ft. Weight is a rounded comparison reference. Large values often depend on indirect or incomplete records.

Bite evidence

Cookiecutter shark: Bite shape is documented; a comparable force maximum is not. Pacific sleeper shark: No standardized maximum is available.

Living versus extinct

Both species are living, but record-sized individuals are rare. These upper references should not be read as normal adult size.

Ecology changes the matchup

Its bite removes a round plug; size alone does not predict ecological impact. Rare encounters make its maximum size less certain than familiar coastal species.

04

TRACE THE CLAIMS

Sources and limits.

Cookiecutter sharkSmithsonian OceanPacific sleeper sharkAlaska Department of Fish and GameHow we standardize comparisonsRead the methodology →